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Bonded Washer Seals are also known as Dowty Seals or Dowty Bonded Washers. They are high pressure seals typically used in the Mechanical, Hydraulic and Pneumatic applications.
Bonded Washers were originally designed to replace copper type washers used in high-pressure systems. They consist of a metal washer and an elastomeric ring bonded inside the diameter. The metal washer prevents over-compression and limits deformation of the elastomeric ring.
Our bonded washers consist of a metal rectangular outer washer with a trapezoid shaped rubber ring bonded to the inner of the ring creating a 1-piece washer with an internal seal. Bonded washers hold a large amount of burst pressure whilst retaining the inner seal shape and limiting deformation resulting in brilliant sealing under high pressures.
EMI Seals & Gaskets Ltd can supply either the Standard style or a Self-Centering style that eliminates the potential of the being slightly seal offset during installation thus simplifying the process. These seals are readily available in Imperial sizes from 1/8 inch to 3 inches. French and German Metric form part of our extensive stock. Imperial and metric size charts can be found at the top of our data sheets below. The inner bonded rubber seal can be manufactured to suit the end user’s application from the following:
| METAL | TENSILE STRENGTH MN/m2 (MINIMUM) | SPECIFICATION |
|---|---|---|
| Mild Steel Pressings | 540 | BS 1449 Part 1 CS4 BRH5 |
| Mild Steel Turned | 540 | BS 970 Part 1 EN8 |
| Stainless Steel Pressings | 540 | BS 1449 Part 2 T316 |
| Stainless Steel Turned | 540 | BS 970 Part 1 T303 |
| Stainless Steel Turned | 540 | BS 970 Part 1 T316 |
| Stainless Steel Turned | 540 | BS 970 Part 1 T304 |
Custom Grades including MilSpec, Def STAN, AS & DTD available. Below is a sample of common grades. Contact us for your unique requirements.
